/* ----------------------------------------------------------------------
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* $Date:        15. February 2012
* $Revision: 	V1.1.0
*
* Project: 	    CMSIS DSP Library
* Title:		arm_abs_f32.c
*
* Description:	Vector absolute value.
*
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
*
* Version 1.1.0 2012/02/15
*    Updated with more optimizations, bug fixes and minor API changes.
*
* Version 1.0.10 2011/7/15
*    Big Endian support added and Merged M0 and M3/M4 Source code.
*
* Version 1.0.3 2010/11/29
*    Re-organized the CMSIS folders and updated documentation.
*
* Version 1.0.2 2010/11/11
*    Documentation updated.
*
* Version 1.0.1 2010/10/05
*    Production release and review comments incorporated.
*
* Version 1.0.0 2010/09/20
*    Production release and review comments incorporated.
*
* Version 0.0.7  2010/06/10
*    Misra-C changes done
* ---------------------------------------------------------------------------- */

#include "arm_math.h"
#include <math.h>

/**
 * @ingroup groupMath
 */

/**
 * @defgroup BasicAbs Vector Absolute Value
 *
 * Computes the absolute value of a vector on an element-by-element basis.
 *
 * <pre>
 *     pDst[n] = abs(pSrcA[n]),   0 <= n < blockSize.
 * </pre>
 *
 * The operation can be done in-place by setting the input and output pointers to the same buffer.
 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
 */

/**
 * @addtogroup BasicAbs
 * @{
 */

/**
 * @brief Floating-point vector absolute value.
 * @param[in]       *pSrc points to the input buffer
 * @param[out]      *pDst points to the output buffer
 * @param[in]       blockSize number of samples in each vector
 * @return none.
 */

void arm_abs_f32(
    float32_t* pSrc,
    float32_t* pDst,
    uint32_t blockSize)
{
	uint32_t blkCnt;                               /* loop counter */

#ifndef ARM_MATH_CM0

	/* Run the below code for Cortex-M4 and Cortex-M3 */
	float32_t in1, in2, in3, in4;                  /* temporary variables */

	/*loop Unrolling */
	blkCnt = blockSize >> 2u;

	/* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
	 ** a second loop below computes the remaining 1 to 3 samples. */
	while(blkCnt > 0u) {
		/* C = |A| */
		/* Calculate absolute and then store the results in the destination buffer. */
		/* read sample from source */
		in1 = *pSrc;
		in2 = *(pSrc + 1);
		in3 = *(pSrc + 2);

		/* find absolute value */
		in1 = fabsf(in1);

		/* read sample from source */
		in4 = *(pSrc + 3);

		/* find absolute value */
		in2 = fabsf(in2);

		/* read sample from source */
		*pDst = in1;

		/* find absolute value */
		in3 = fabsf(in3);

		/* find absolute value */
		in4 = fabsf(in4);

		/* store result to destination */
		*(pDst + 1) = in2;

		/* store result to destination */
		*(pDst + 2) = in3;

		/* store result to destination */
		*(pDst + 3) = in4;


		/* Update source pointer to process next sampels */
		pSrc += 4u;

		/* Update destination pointer to process next sampels */
		pDst += 4u;

		/* Decrement the loop counter */
		blkCnt--;
	}

	/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
	 ** No loop unrolling is used. */
	blkCnt = blockSize % 0x4u;

#else

	/* Run the below code for Cortex-M0 */

	/* Initialize blkCnt with number of samples */
	blkCnt = blockSize;

#endif /*   #ifndef ARM_MATH_CM0   */

	while(blkCnt > 0u) {
		/* C = |A| */
		/* Calculate absolute and then store the results in the destination buffer. */
		*pDst++ = fabsf(*pSrc++);

		/* Decrement the loop counter */
		blkCnt--;
	}
}

/**
 * @} end of BasicAbs group
 */
